May 28 in Military History

The Spanish Armada of 130 ships departed Lisbon under the Duke of Medina Sidonia, beginning the doomed campaign against England that would be shattered by English fireships and Atlantic storms.

George Washington's surprise attack on a French party helped spark the Seven Years' War, a global conflict that reshaped the world.

The US 1st Infantry Division captured the village of Cantigny in the first sustained American offensive of World War I, proving that American troops could conduct successful offensive operations.

The Dionne quintuplets, five identical sisters, were born in a rural Ontario farmhouse, becoming the first quintuplets known to survive infancy. The intensive infant-care protocols developed for the sisters through the Dafoe Hospital and Nursery shaped Canadian and U.S. military pediatric care through the 1940s and influenced post-war military medical training.

King Leopold III of Belgium surrendered to German forces, exposing the left flank of the Allied armies at Dunkirk and complicating the ongoing evacuation.

The US Army fired the first nuclear artillery shell from a 280mm "Atomic Annie" cannon during the Upshot-Knothole Grable test at the Nevada Test Site, demonstrating tactical nuclear capability.

NASA and Marine Corps teams completed final pre-flight preparations for Alan Shepard's Freedom 7 suborbital mission, which had been delayed from late April. Shepard, a Marine Corps aviator, became the first American in space on the May 5 launch, and the May 28 period produced the operational lessons that shaped subsequent Mercury and Gemini mission planning.

NASA launched Mariner 9 from Cape Kennedy on an Atlas-Centaur rocket, the first spacecraft to orbit another planet. Its arrival at Mars in November 1971 produced the first global map of the Martian surface, shaping later U.S. military and civilian Mars reconnaissance and weather-forecasting architecture.

West German teenager Mathias Rust flew a Cessna 172 from Helsinki through Soviet air defenses and landed near Red Square in Moscow, humiliating the Soviet military and leading to a shake-up in the defense establishment.

NATO heads of state and Russian President Vladimir Putin signed the Rome Declaration establishing the NATO-Russia Council, a formal consultation body intended to develop cooperative military relationships. The Council survived through 2014 and shaped NATO-Russia relations through Afghanistan, counter-terrorism, and naval cooperation until the Crimea annexation suspended its operation.